Winter anti-freezing
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In the ammonia synthesis and urea production plants that use natural gas as raw material, when operations are suspended in winter, the circulation water pumps have to be stopped. How can the various water coolers and process systems be protected from freezing? What are the precautions?
Ethylene glycol should be added, with the specific concentration determined by the local minimum temperature plus a margin for further drops (for example, 10 degrees Celsius). As for the relationship between ethylene glycol concentration and freezing point, you can find out by searching on Baidu
Drain any remaining water; when the system is out of use for an extended period, it is necessary to purge it with nitrogen and maintain pressure with nitrogen to prevent corrosion.
During short periods of shutdown, it is recommended to keep the circulating water system operational to ensure that the water remains in flow. Paying attention to checking the high and low points will help prevent freezing effectively； For prolonged shutdowns, it is recommended to drain the water from the circulating water system and purge it with nitrogen to maintain pressure.